MCQs

Chemical Engineering MCQs with Explanations

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1221Chemical EngineeringMedium

95% (by volume) of LPG at 760 mm Hg pressure will evaporate at ________ °C?

B55

C30

D-40

Correct answer

A. 2

Explanation

The correct answer is 2.

1222Chemical EngineeringMedium

The reaction A → B is conducted in an adiabatic plug flow reactor (PFR). Pure A at a concentration of 2 kmol/m3is fed to the reactor at the rate of 0.01 m3 /s and at a temperature of 500 K. If the exit conversion is 20%, then the exit temperature (in k) is (Data: Heat of reaction at 298 K = – 50000 kJ/ kmole of A reacted Heat capacities CPA = CPB = 100kJ/kmole. K (may be assumed to be independent of temperature))?

A500

B400

C1000

D600

Correct answer

D. 600

Explanation

The correct answer is 600.

1223Chemical EngineeringMedium

In order to be called steel, an alloy should have iron percentage greater than________?

A90

B50

C80

D70

Correct answer

C. 80

Explanation

The correct answer is 80.

1224Chemical EngineeringMedium

At standard conditions, N2 + 2O2 ⇌ 2NO2; ΔG° = 100 kJ/mole NO + 1⁄2O2 ⇌ 2NO2; ΔG° = -35 kJ/mole The standard free energy of formation of NO in kJ/mole is________?

A30

B170

C15

D85

Correct answer

D. 85

Explanation

The correct answer is 85.

1225Chemical EngineeringMedium

Which of the following is used for the concentration of rubber latex?

AShort tube evaporator

BLong tube vertical evaporator

CAgitated film evaporator

DCalandria

Correct answer

C. Agitated film evaporator

Explanation

The correct answer is Agitated film evaporator.

1226Chemical EngineeringMedium

In the reaction, H2 +I2 ⇌ 2HI, addition of an inert gas will________?

AIncrease the partial pressure of I2

BIncrease the partial pressure of H2

CIncrease the total pressure and hence shift the equilibrium towards the right

DNot affect the equilibrium conditions

Correct answer

D. Not affect the equilibrium conditions

Explanation

The correct answer is Not affect the equilibrium conditions.

1227Chemical EngineeringMedium

For an autocatalytic reactor, the suitable reactor set up is________?

ACSTR in series

BCSTR followed by P.F. reactor

CP.F. reactors in series

DP.F. reactor followed by CSTR

Correct answer

B. CSTR followed by P.F. reactor

Explanation

The correct answer is CSTR followed by P.F. reactor.

1228Chemical EngineeringMedium

Which of the following resistances is not involved in a gas phase catalytic (gas-solid) reaction?

AGas film and pore surface diffusion resistances for products

BSurface phenomenon resistance

CAsh resistance

DGas film and pore surface diffusion resistances for reactants

Correct answer

C. Ash resistance

Explanation

The correct answer is Ash resistance.

1229Chemical EngineeringMedium

Out of the following ________ iron has the best capability to bear sudden & excessive shocks?

AWrought

BWhite

CPig

DCast

Correct answer

A. Wrought

Explanation

The correct answer is Wrought.

1230Chemical EngineeringMedium

Spray dryer for evaporating milk to produce milk powder is made of________?

ACast iron

BLead lined steel

CStainless steel

DAluminium

Correct answer

C. Stainless steel

Explanation

The correct answer is Stainless steel.

In the reaction, H2 +I2 ⇌ 2HI, addition of an inert gas will________?

AIncrease the partial pressure of I2

BIncrease the partial pressure of H2

CIncrease the total pressure and hence shift the equilibrium towards the right

DNot affect the equilibrium conditions

Correct answer

D. Not affect the equilibrium conditions

Explanation

The correct answer is Not affect the equilibrium conditions.